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What is biogas?
Biogas is formed when organic material is decomposed by microorganisms in an oxygenfree environment, so called anaerobic digestion. In a biogas process, many different microorganisms participate in a complex web of interacting processes which result in the decomposition of complex organic compounds such as carbohydrates, fats and proteins to the final products methane and carbon dioxide. This process occurs naturally in many environments with limited access to oxygen, for example in bogs and marshes, rice paddies and in the stomach of ruminants, such as cows.

This natural process is exploited in a biogas plant, where organic material such as sludge from wastewater treatment, manure, crops and food waste is placed or pumped into a completely air-tight container or digestion chamber (reactor). Raw biogas is formed, which mainly consists of methane and carbon dioxide, but also small amounts of nitrogen gas, ammonia and hydrogen sulphide. Biogas is often saturated with water vapour. In addition to biogas, a nutrient-rich digestion residue is also formed that may be used as a fertilizer.

Read more about biogas
Biogas in Sweden - from raw material to use and how to become a producer of biogas.
Download a summary of this website in English

Biogas - from refuse to energy
A report produced by International Gas Union (IGU) in co-operation with Swedish Gas Association.
Download report 

Short videos
We've collected some short videos about biogas, in both Swedish and English
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